Trichloroisocyanuric Acid → Ethyl (2-formamido-5-chlorothiazol-4-yl)glyoxylate

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A suspension of ethyl 2-(2-formylamino-1,3-thiazol-4-yl)glyoxylate, which can be represented as ethyl 2-(2formylimino-2,3-dihydro-1,3-thiazol-4-yl)glyoxylate, (6.9 g.) in dimethylformamide (40 ml.) was heated at 60° C. to produce a solution, and to the solution was dropwise added a solution of trichloroisocyanuric acid (2.8 g.) in dimethylformamide (10 ml.) over 15 minutes at the same temperature with stirring and then the mixture was further stirred for 1 hours at the same temperature. After the reaction, the reaction mixture was poured into ice-water (400 g.). The precipitates were collected by filtration, washed with water and then dried to give ethyl 2-(2-formylamino-5-chloro-1,3-thiazol-4-yl)glyoxylate, which can be represented as ethyl 2-(2-formylimino-5-chloro-2,3-dihydro-1,3-thiazol-4-yl)glyoxylate, (7.1 g.), mp. 151° to 153° C. The remaining filtrate was extracted with ethyl acetate, and the extract was washed with water and then dried over magnesium sulfate. The solvent was distilled off from the extract to give further the same object compound (0.75 g.).

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